package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest)servletRequest;

        HttpServletResponse response=(HttpServletResponse) servletResponse;

        //1.获取本次请求的URI
        String requestURL = request.getRequestURI();// /backend/index.html

        log.info("拦截到请求:{}",requestURL);

        //定义不需要处理的请求路径
        String[] urls=new String[]{
                 "/employee/login",
                 "/employee/logout",
                 "/backend/**",
                 "/front/**",
                 "/user/sendMsg", //移动端发送短信
                 "/user/login", //移动端登录
                 "/doc.html",
                 "/webjars/**",
                 "/swagger-resources",
                 "/v2/api-docs"
        };

        //2、判断本次请求是否需要处理
        boolean check = check(urls, requestURL);

        //3、如果不需要处理，则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURL);
            filterChain.doFilter(request,response);
            return;
        }

        //4.判断登录状态,如果已登录,则直接放行
        if(null!=request.getSession().getAttribute("employee")){
            log.info("用户已登录,用户ID为：{}",request.getSession().getAttribute("employee"));

            //存在线程中的id
            BaseContext.setCurrentId((Long)request.getSession().getAttribute("employee"));

            filterChain.doFilter(request,response);
            return;
        }

        //4-2.判断登录状态,如果已登录,则直接放行
        if(null!=request.getSession().getAttribute("user")){
            log.info("用户已登录,用户ID为：{}",request.getSession().getAttribute("user"));

            //存在线程中的id
            BaseContext.setCurrentId((Long)request.getSession().getAttribute("user"));

            filterChain.doFilter(request,response);
            return;
        }


        log.info("用户未登录");
        //5.如果未登录则返回未登录结果.通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }


    /**
     * @description:路径匹配
     * @author: yanhongwei
     * @date: 2023/5/15 20:47
     * @param: [requesURI]
     * @return: boolean
     **/
    public boolean check(String[] urls,String requesURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requesURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
